Shell command to add permissions to a user mailbox?

I have a user mailbox on my Exchange 2010 server that many people share access to. Is there a cmdlet that will allow me to add/remove shared permission to the inbox for that user's mailbox? Ordinarily I would just reset the password and sign in as that user and change the sharing permissions through Outlook. In this case however, the box is tied to a service account and the password cannot be reset without causing all kinds of mayhem. Is there a way to do it at the server?

This process describes the steps required to Import and Export data from and to .pst files using Exchange 2010. We can use these steps to export data from a user to a .pst file, import data back to the same or a different user, or even import data t…

In this video we show how to create a mailbox database in Exchange 2013. We show this process by using the Exchange Admin Center.
Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center.
Navigate to the Servers >> Data…